Clamp.



E.1.ANDERSON.

CLAMP.

APPLICATION FILED MAY 15. 19w.

Patented J an. 9, 1917.

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EnooH J. ANDEEson, or WORCESTER, MAssAcHnSETTs.

CLAMP.

Specification of Letters'Patent.

Patented Jan. 9, 1917.

Application filed May 15, 1916. j Serial No. 97,570.

to provide a clamp having a movable jaw' that is capable of being movedback and forth with any desired degree of rapidity,

and that will positively hold when the pressure is put on the jaw; alsoto provide an improved form of jaw in which thetwo parts ofwhich it ismade are connected together in such a way as to be accurately guidedwith respect to each other, and in which the connection between the twoparts is improved so as to provide for moving the movable part with anydegree of speed, and prevent its being dislodgedfrom the relativ'elystationary portion which is slidable along the clamp bar; and especiallyto provide an improved nutand screw connection between these parts ofsuch a nature: that the same can be adjusted out and in very readily tochange the point of application of pressure and yet be capable of beingap plied in a convenient manner on assembling the parts.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawingsin which Figure 1 isa side'elevation of. a preferred embodiment of this invention; Fig. 2 isa plan of the same, showing the movable aw in section on the line 22 ofFig. 1; Fig. 3 is a sectional view on the line 3.3 of Fig. 2, and Fig. 4is a rear end view of one of the jaws.

The invention is shown as applied to a p'attern-makers clamp involving amain bar 10 which preferably is hollow throughout its length, and astationary jaw 11 integrally mounted on the end of the bar. This bar isprovided with a series of narrow teeth 12 along its upper edge. Themovable jaw comprises two parts 13 and 14. The member 13 is simply acasting having an inclined projection provided with a passage through itfor the bar 10. Integral teeth 15 are located along the lower side ofthe upper edge of said passage, said teeth being of twice the pitchofthe teeth12 so that they will fit alternate teeth 12 in the mannerindicated more clearly in Fig. 3. This member 13'is a box-like structurehaving side and end walls which inclose the space within it whichreceives the movable part 14 of this jaw. The member 13 also is providedwith a slot 16 along its rear surface having a circular enlargement 17at the end The member 14 or jaw proper'ls provided with a fiat operativesurface projecting from a main portion of the jaw which'telescopeswithin the space in the member. 13 above described. This telescopingportion is provided with a longitudinal passage for holding a nut 21,the passage extending from the lower end to the upper end where it opensout through the end for a purpose to be described. This nut fits withinthe member 14, and is adapted to slide along the passage therein. Itis'provided with an integral eX- tension 22 at one side having two lugs23 and 24 projecting from one face thereof. At the end it has aprojection 25. When the malleable iron nut is cast this projection 25 isperpendicular to the arm 22, but is designed to be bent over as shown inthe drawings to clamp a spring 26 between it and the lug 24. This forcesthe spring back also against the lug 23, and leaves its end projectingso as to engage the inner surface of the jaw 14. Thus it normallypresses the nut against the shoulder of the member 14 by constant springpressure, so that it will not get dislodged too easily. For the purposeof securing the nut a'screw 30 is shown. This screw is provided with anenlarged collar 31 circular in form, preferably, and

with a winged end 32 for manipulation.

This collar 31 is adapted to move in through the circular slot 17 so asto come in behind the slot 16 and be guided between the inner surface ofthe member 13 and two walls 33 projecting inwardly from that member.

The operation of the device is very simple. The member 13 can be swungover at the top toward the I stationary jaw 11 and then moved back andforward along the bar 10 as far as may be desired. \Vhen it is swungback its teeth 15 will catch into the teeth 12 and hold it againstfurther motion backwardly although it can be moved up toward the jaw 11without trouble. Pressure is applied by turning the screw 30, which hasaleft-hand thread, preferably. In this way the screw is threaded in theproper direction to force the jaw 14 toward the jaw 11 by turning thescrew in the natural direction, while the member 13 remains stationary.Vhen thescrew 30 is loose it can be moved out and in along the slot 16without becoming disengaged and then pressure can be applied at anydesired distance from the bar 10. In assembling the parts the nut 21 isfirst placed in the jaw member 14, and then the screw is insertedthrough the hole 17 and moved up into the slot 16. This screw is thenbrought into registration with the nut, which is easily done, becausethe nut is not threaded clear to its end. The screw can then be turnedto bring the two parts together. If desired the screw and nut can bemoved out to the end of the jaw 14 which is open at the end, andthescrew headed or riveted over so that it is permanently engaged withthe nut, and then these four elements are thereafter inseparable,although readily adjustable with respect to each other.

With this construction the adjustment of the parts is very simple andconvenient, and the final application of pressure to the clamp isprovided for in such a mannerthat it is manipulated readily either byskilled or unskilled workmen. No parts are likely to be lost, and theconstructionis inexpensive and mechanical. The housing'of the part ofthe jaw 14 inthe member 13 provides for guiding these parts withrespectto each other,

and adds to'the convenience with which the tool may be used;

7 Although I have illustrated and described. only a single embodiment ofthe invention I am aware of the fact that'many modifications can be madetherein bygany person skilled in the art without departing from thescope of theinvention, as expressed in the claims. ThereforeI do notWish to be limited to all the details of construction herein shown anddescribed, but} Q .VVhatIdo claimis:v T V W 1; As an article ofmanufacture, a hand clamp comprising a bar having teeth on one 7 edge, aj awmounted at one endthereof, and a l a movable jaw memberjcomprlsmgtwo main parts, a member-having a passage therein 77 "for receiving thebarwhereby said member is slidable along the bar and having in thesurface which engages the toothed edge of the bar a plurality of teethhaving a pitch consisting of a multiple of the pitch of the teeth on thebar, and a jaw member movably connected therewith and carried thereby.

As an article of manufacture, a hand clamp comprising a toothed barprovided with a jaw thereon, a member readily adjustable along said barand having a casing-like form, a jaw provided with a main body locatedwithin the casing of said movable member and adjustable therein towardand from the first named jaw, said movable jaw being provided with alongitudinal passage, a nut in said passage, and a screw connected withsaid nut and with said movable member, said nut being slidable with thescrew along said passage for adjustment.

3. As an article of manufacture, a hand clamp comprising a bar and jawconnected together, a member movable along the bar, a movable jawadjustably carried by said member, said movable jaw having a.longitudinal passage therein, a nut slidable in said passage, and aleft-handed screw connected with said nut having an enlarged collartherein, said movable member being provided with a pair of guides forthe opposite sides of said collar.

4:. As an article of manufacture, a hand clampcomprising a bar and jawconnected together, a member movable along the bar, a movable jawconnected with said member, said movable jaw having a passage therein, anut slidable in said passage, a screw connected with said nut having anenlarged collar thereon, said movable member being provided with a pairof guides for the opposite sides ofsaidcollar, and with a longitudinalslot between them. for the screw, said slot having an enlargement at theend near the bar for permitting the collar to be introduced.

' ,5. As an article of manufacture, a hand ably carried by said member,said movable jaw having a longitudinal passage therein open at its outerend, a nut slidable in said passage, a left-handed screw connected Wlthsaid nut havlng an enlarged nut thereon projecting through said nut andheaded over at'its end, said movable member being provided with a pairof guides for said collar, said nut having a projection therefrom, apair of lugs on said projection, means on said projection for securing aspring against one of said lugs and a spring secured against one of saidlugs and bearing against the other and also bearing at its free end onthe inner side of said movable jaw.

In testimony whereof I have hereunto set my hand.

ENOOH J. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G."

